Valve grinder



J. H. K. CARPENTER VALVE GRINDER Filed April 2, 1928 LI-LKI arp ETPLEF April 16, 1929.

Y casing and means enclosed within the casing .Patented Apr.' 16, 1929.y

' UNITED STATES JOHN H; K. CARPENTER, or RI'cHMoNnyI-RGINIA. f

'VALVE GRIN'DERQy Application fried April ,2,

.This invention relates to valve grinders and; one lobgect of the invention is to provide a device for grinding valves which may be employed in connection with an elec-` tric drill serving as a power unit and thereby allow the valves-tobe quickly ground with -a minimum amount of'labor on the part of the operator.

. Another yobject of the invention is to pro/ vide a device of this cliaracterin which' aV driveshaft and adriven shaft forming elements thereof are rotatably supported by a yfor converting rotary movement of the drive shaft kinto oscillating movement yfor theY VAnother objectofthe invention is to Vso .fformrthe casing that it may. constitute a shield Vfor elements contained therein and also a grease kcontainer so that the parts of the valve grinder will be Well lubricated and to further 'permit the'casing to bereadily opened when'it is necessary to take the valve grinder apart in'order to clean or repair the V' same or replenish the supply of lubricating grease inthe casing.

' Another object of the invention is to provide .the valve grinder with `an attaching yoke for engagement withan electric drill and securelybut releasably connectthe Vyokel with the casing v by fasteners which serve not only-as .means for securing the yoke but Ialso to releasably secure a removable bottom of the casing in place..

Another object of the invention is to p roc vide vthe vcasing withvery good means to l yrotaia-bly mount the drive s haftand driven rprevented.

shaft and to so form a bearing -for the. Y

its lconstruction and consist of a comparav tively lewnuinbcr of parts all of which are very Astrong rand durable and .not liable to v` easily breakl or get out orV order.

yThe invention is illustrated inthe yaccom-l v ing through. the casmgbetween,theutwo Figure 1 is a vieW- showing ,the vvalve' panying drawing, wherein grinder partially in section and partially .in

` sideelevationand connected with an electric of kwhich isshownin eletransversesectional view 1928.y Serial No. 266,669.

PAT-ENT .OFI-ical through the casingv of the valve grinder i taken on the line 2 2 ofFigflyand Fig. 3 is a transverse sectional VView through the valve grinder taken von the' line K- 3f-3 of Fig.' 1 and showing the casing in.

topman. The improved the vsubject-matter vof thisinvention is intended for use in connection with an electric drill, a portiono WhichV is shown in elevation in Fig. 1 and indicated in general` by the numeral 1. vThis wdrill is of a. Couven-- tional construction and includes a rotary shaftfZ carrying a chuck which is threaded upon the shaft 2Van'diwhen rotated thereon .moved into or out of positionto grip theV drive shaft of the valve grinder in the samer' inanner it'will VThe casing 4 ot the .valve grinder is valve grinder constituting grip va bit of aconventional construction. Y Y

formedof strong metal Iand includesan upperhead having an annular Wall fornied integral. therewith. The casingis open `at its lower end and this openeiid of the casing is normally closed by a cap or head 6 which fits vagainst the. annular walls where it is removablysecured by bolts 7 passed through openings formed in Vbosses vS. rwhich are f .f spaced from each other aboutthe casing, as .shown in, Fig. `2. By v.this arrangement the capor head. Gmaybevery easily rremoved .when it `'is necessary to` vhave access tothe interior of the casing in order to make repairs or adjustments or replenish a supply of lubricating grease Vwithwhich the casing g n 9 extends downwardlyromthe head'6 in opposed relation to a companion bearing Vneck 10 .which projects upwardly from the head. of upper wall of the casing and the upper. wall, of the casing carriesa'second bearing neck 1 1 disposed in spaced relation i to the bearing 10, as-shown inlFig. v1L Thesey bearings are to rotatably receive the dri-ve shaft 12 and driven shaft13, the drive shaft being rotatably received in `the vbearing 11 and ythe driveny shaft rotatably-received in thebearimggrst) and=10 with .aY portion extend- 1 companionbearings.

Wardly therefrom withitsfupper end portion 12` reduced and so formed-that itinay 'be receivedin the chuck Iof the electric l will be prelicrablyvfilled. kA bearinP neck Y drill and firmly gripped thereby. At its linner endv the drive shaft carries a circular Aie disk or head 14' from which extends a depending pin 15 disposed adjacent its periphery, 'as shown in Fig. 2, and a wearing washer 16 is fitted upon the shaft between its head and the inner end of the bearing. A

similar washer 17 is disposed about the driveshaft against the outer or upper end of the bearing and securing nuts 18 and 19 are threaded upon the shaft4 above the washer V17. It will be readily seen that by properly adjusting the nut 18 the shaft may be secured in such position thatit will be permitted to turn `freely but prevented from having longitudinal movement and the clamp nut 19 then tightenedto firmlyloek the nut 18 in place.

VThe driven shaft 13 carries a ycollar 2() which is fixed thereon in any desired manner and lcarries a depending pin 21 adapted to fit into an eye formed at one end of a pitman 22, the other end of which is also formed with an eye to'receive the depending` pin 15 of the disk 14.A It will bel readily seen from an inspection of Fig. 2 that, when the drive shaft is rotating, t-he pitman which 'connects the disk 14 with the collar 20 will cause oscillatory movement to be imparted to the driven sha-ft and, therefore, a valve 2.3 engaged by the bit 24 carried by the driven' shaft Ywill be turned against its seat 25 first v' ling sleeve 29'fits about the driven shaft between the collar 2O and removable head 6 ofthe casing and serves to prevent*` the i driven shaft `from sliding downwardly out of, its proper position.

ment the driven shaft will be rotatably supported with its upper end contacting with the bearing ball and it will be permitted to freely rotate when oscillating without having vert-ical movement. If" the upper end of theV driven shaft should become worn so that the driven shaft has vertical play, it

merely necessary to loosen vthe nut 28 and after tightening'` the screw 27 asuflicient' eX- tent to compensate for the 4wear againV tighten the securing nut. VThe pins 15 and 21 terminate close to the removable head of Y the casing and, therefore, the pitmanwill be prevented from dropping downwardly out of operative engagement with vvthem when the valve grinder ism use.

The yoke 30 which is Vemployed to con.- nect the valve grinder with theelectric drill is also *formed ofstrong metal and By v'this arrange-V lifroaaas consists of an upright standard having an arm l'cxtending from its upper end and terminating in an enlarged eye or collar 32 of suflicient size toi easily it upon the body portion of the drill adjacent the lower end thereof. A set screw 33 is carried by the collar and when tightened will serve to firmly hold the collar upon the drill.l At its ylower en'd the yoke is provided with a base 34 of an arcuate formation and preferably constituting the major portion of aY circle of slightly less diameter than the casing. It will be obvious that'the base may con.- stitute an entire circle if so desired. This base nts against the upper face of the casing and is formed c with` openings spaced from each other at such distances that the screws 7 which secure the head 6 in place may also be employed to secure the base firmly against the casing. Therefore, it is notnecessary to provide separate v securing means for-the yoke and removable head of the casing. Y

When the valve grinder is to be used,;the

Vcollar is slipepd upwardly over the chuck 3 into place about the lower end of the casing of the drill and as this movement takes place the upper end of the'drive shaftV enters the chuck. The set screw 33 and the chuck are now tightened so that the chuck will have 9 firm gripping enga-gement with the drive shaft'vand the yoke will be firmly anchored to the drill. If the bit carried by therdrive shaft is of the proper size and shape,iitis engaged with the head of the valve or if it is found thatA the bitfdoes not fit the valve it is removed and one of theproper size or shape substituted. After v the bit is engaged with the valve, the current is turned on to energize the drill and as the shaft of the drill rotates the drive shaft 12 will be ron tated with it. As the drive shaft and its head or disk 14 rotate reciprocating movement will be imparted to the pitman andthis pitman ,through` its connection with the collar 2O carried by the driven shaft will im` part oscillating movement to the driven shaft. Therefore, the driven shaft will rotate first in one direction and then in a reverse directionl and a similar motionV will be imparted to the vvalve so that its head and the seat 25 for the valve head will be accurately ground with respect to each other. In Y view of the fact thatv the drive shaft will be very rapidly rotated and the driven shaft also moved ata rapid rate of speed, the valve and its seat will be very quickly ground.` After one valve and vits seat have been ground, the valve grinderV will be released from the valve and transferred to anotherV to be ground. If ,it isfound that it is neces- @sary` tof: replenish grease-.1n thevcasing or make adjustments or repairs to any ofthe parts enclosed therein,- it is merely necessary to remove thebolts 7 and the'head G of the at its bott-om7 a cap for the open lower end casing may be lifted out of place. The necessary repairs orcleaning can then be performed and a new supply of lubricating grease placed in the casing, after which the removable head of the casing will be again set in place and secured by the bolts. Vhen 'the cap or head is removed,-the pitman may Vand reassembled.

An opening 34 which is normally closed by a plug 35 is provided so that oil or grease may be forced into the casing when the plug 1s removed without releasing the cap 6. I

Having thus described the invention, I claim:

A valve grinder comprising a casing open of the casing, the cap and head of the casing having alined bearing sleeves projecting outwardly therefrom one above the other and It will rthus be.

,thehead of the casing having a second bear-l ing spaced from the bearing sleevethereof, l a drive shaft rotatably mounted inthe second bearing of the 'casing andfhaving. a head at its inner end and its outer end portion projecting upwardly for` connection withthev shaft of al power unit, a driven shaft journaled in the alined bearing sleeves of the cap and easing with a portion extending through the casing, a bearing ball in the upper bearing sleeve, a thrust pin screwed into the upper end of the upper bearing sleeve and enga-ging `said ball to hold the ball in engagement withthe upper end of said driven shaft, a collarl vfast upon the driven shaft .within'the casing, pins extending from the collar and head, apitman extending between the head and collar and having eyesat its ends loosely engagedv with the pins and' serving to transform rotary motion of the drive shaft into oscillating motion for the driven shaft, andmeans to suspend the cas.- ing from a power unit yin spaced relation beneath the same with the drive shaft operatively engaged withthe power uni-t.

In testimony whereof IaiiX my signature.

JOHN H. K; CARPENTER. LL. s] V- 

